643 results about "Base metal" patented technology

The invention provides base metal conductive paste for a photovoltaic cell and a preparation method, a use method and application thereof, and the conductive paste comprises the following components in percentage by mass: 5-60wt% of oxide coated base metal powder, 27-77wt% of silver powder, 2-5wt% of glass powder, 0.1-3wt% of an antioxidant aid and the balance of an organic carrier; wherein the base metal powder comprises one or more of copper, tungsten, tin, nickel, aluminum and alloy powder of the copper, the tungsten, the tin, the nickel, the aluminum and the alloy powder of the aluminum, and the oxide comprises one or more of silicon oxide, aluminum oxide, titanium oxide and boric oxide. The base metal powder coated with a specific type and a proper amount of oxide is selected and matched with the oxide and the glass powder which are good in compatibility, the manufacturing cost of the conductive paste and the battery can be effectively reduced, meanwhile, the conductive paste is applied to TOPCon and BC batteries, and the battery conversion efficiency can be kept equivalent to or even superior to that of traditional pure silver conductive paste.

The invention relates to a hot-rolled wire rod for a 1960MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after high-carbon components of C-Si-Mn-Cr-B are rolled and spun into a wire rod, the wire rod is subjected to rapid online molten salt isothermal treatment, and the wire rod is subjected to front-section molten salt treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state; the steel wire rod is subjected to rear-section molten salt treatment, the molten salt temperature is reduced, unconverted retained austenite is promoted to be converted into the sorbite structure, meanwhile, isothermal tempering of the structure and fusing of a part of sorbite lamellas are promoted, and finally slow cooling is conducted through a roller way; the microstructure of the hot-rolled wire rod comprises a mixed structure composed of tempered sorbite, ferrite and fused sorbite, the tensile strength is 1305-1355 MPa, the percentage reduction of area is 37%-42%, and the hot-rolled wire rod is used for being used as base metal to manufacture high-strength stranded wires and other application fields and is beneficial to reducing the risk of wire breakage.

The utility model discloses a marine lean leveling tool for segmented welding. The marine lean leveling tool comprises a flat-bulb steel leveling device, a T-shaped profile leveling device and an angle steel leveling device, the three devices are optimized, so that the use is more convenient, the original limitation is overcome, and the requirements of an actual production field are met; the three devices achieve leveling and butt joint of steel plates such as flat-bulb steel, T-shaped profiles and angle steel on a ship body, plate stacking and folding are omitted, steel structures in the steel plates are not damaged, base metal is protected, operation is easy, a large number of welding materials and polishing working hours are saved, working efficiency is improved, and the working environment of workers is improved; the tool is long in service life and convenient to disassemble and maintain, the work efficiency is improved, the hull structure is effectively protected, and all leveling work can be completed through single-person operation.

The invention discloses a surface treatment process of a hydraulic rod and a coating monitoring system, relates to the technical field of electroplating, and aims to solve the problems that various complementary sensing technologies cannot be integrated, information such as thickness, uniformity and microstructure cannot be synchronously acquired in a lossless, in-situ and real-time manner, and closed-loop control cannot be formed based on the information in the background technology. According to the scheme, the method comprises the steps that PR electrolytic degreasing is conducted, a workpiece serves as an anode, an oil film is torn through the oxygen evolution effect, an extremely-thin oxidation film possibly existing on the surface of the workpiece is dissolved, base metal is completely activated, and an optimal combination basis is provided for a follow-up coating; and washing with hot water, namely removing residual alkaline degreasing fluid and emulsified oil stains by using hot water with the temperature higher than 60 DEG C in a stirring and spraying manner. According to the method, multi-dimensional information such as the thickness, the uniformity and the microstructure can be synchronously obtained in a lossless, in-situ and real-time mode in the surface treatment process, closed-loop control is formed based on the information, and it is ensured that plating growth is always located on the optimal track.

The invention relates to the technical field of composite material and metal connection, in particular to a carbon / carbon composite material, a modification method and a nickel-based high-temperature alloy brazing method thereof, a SiC coating and a Mo-Si coating are sequentially embedded and sprayed on the carbon / carbon composite material, and a SiC-MoSi composite coating is formed on the surface of the carbon / carbon composite material through high-temperature heat treatment curing. Due to the existence of the SiC-MoSi composite coating, a CTE transition layer is provided for a connector, residual stress caused by thermal expansion difference is reduced, conditions for generating Mo-based compounds are created, wettability and interface bonding strength of brazing filler metal and base metal can be improved, interface reaction of the base metal can be optimized, a uniform and continuous brazing layer is formed, and the service life of the brazing filler metal is prolonged. Therefore, the brazed connection is higher in strength and more stable, and is more suitable for connection of large-size components and service under the high-temperature condition. The problems that in the prior art, the connection performance of a carbon / carbon composite material and dissimilar metal is poor, and failure is prone to occurring are solved.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention discloses a B-type sleeve welding control system and method, and belongs to the technical field of welding automation, and the B-type sleeve welding control system comprises a welding trolley, a welding gun, a visual perception unit and a control unit. By constructing a composite sensing system combining laser vision, molten pool recognition and welding gun sounding calibration, continuous and effective positioning in a narrow space in the sleeve under the condition that multiple layers of welding beads cover layer by layer is achieved. A welding gun is used for conducting welding wire penetration detection in a set coordinate system, space point positions are recorded in real time when the end of a welding wire makes contact with a sleeve and a base metal entity, self-adaptive correction of a welding bead starting point and a swing center is achieved, the positioning precision in the welding process of multiple layers of welding beads is greatly improved, and reliable reference is provided for follow-up path planning of the welding beads. A multi-sensor fusion algorithm is adopted, parameters such as the swing amplitude, the swing frequency, the welding height and the walking speed in the welding process are adjusted in real time, and the forming quality consistency of multiple layers of welding seams can be guaranteed.

The invention provides an ultra-low carbon duplex stainless steel all-position welding flux-cored wire and a welding method thereof.The outer skin of the flux-cored wire is a stainless steel strip, the flux-cored wire is filled with powder, and the powder comprises, by mass, 18-25% of natural rutile, 20-30% of stainless steel powder, 20-30% of stainless steel powder, 20-30% of stainless steel powder and the balance stainless steel powder. 3-5% of sodium titanate; 5-10% of quartz sand; 0.5 to 4 percent of zircon sand; 1-3% of sodium fluoride; 15 to 25 percent of ferromolybdenum; 3-6% of nitrided ferrochrome; 2-4% of electrolytic manganese; 5-8% of nickel powder; 27 to 32 percent of metal chromium; 0.5-2% of magnesium powder; 0.5 to 1.5 percent of bismuth oxide; and 1-4% of silicon iron. The flux-cored wire is used for all-position welding of third-generation duplex stainless steel, welding spatter is small, and weld joint forming is good; the carbon content of a weld joint is extremely low, and through component and welding process control, weld joint metal has strength, plasticity, toughness and corrosion resistance equivalent to those of base metal. And the double requirements of high strength and toughness and high corrosion resistance in the manufacturing fields of submarine pipeline laying, shipbuilding, marine gas field exploitation and the like are ensured.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention discloses an intermediate layer for resistance spot welding of aluminum / steel dissimilar metals and a resistance spot welding method, the intermediate layer is a FeMnCuNi medium-entropy alloy, and the intermediate layer comprises the following components by atomic percent: 20-30% of Fe, 20-30% of Cu, 5-10% of Ni, 5-10% of Ni, and the balance of Fe and inevitable impurities. 20%-30% of Mn; 20%-30% of Cu; the sum of the atomic percentages of all the components is 100%. The method comprises the steps that (1) the aluminum alloy plate and the steel plate serve as welding base materials to be assembled in a lap joint mode, and the middle layer is added to the lap joint area; and (2) through resistance spot welding, a part of the middle layer and the base metal are melted through resistance heat at the lap joint interface, high entropy of nuggets is achieved through atomic diffusion and the high entropy effect, a welding joint with a solid solution as the main part is formed, and the aluminum / steel dissimilar metal composite structure is obtained. Compared with an existing aluminum / steel resistance spot welding technology, high entropy of nuggets is achieved by applying the high entropy effect, generation of brittle-hard phase intermetallic compounds in a welding joint is remarkably reduced, and a high-performance aluminum-steel composite structure is easily obtained.

The invention relates to the technical field of rare earth steel welding, in particular to a rare earth steel structure welding device and method. Comprising a plurality of supporting units used for bearing the rare earth steel structures, a gas shield welding unit is arranged between every two adjacent supporting units, and the gas shield welding units are used for conducting backing welding on weld joint areas, fixed to the supporting units, of the rare earth steel structures; first transverse moving mechanisms are arranged on the two sides of the supporting unit, vertical moving mechanisms are arranged on the two first transverse moving mechanisms correspondingly, a moving cross beam plate is arranged between the vertical moving mechanisms, the submerged-arc welding unit and the cleaning unit are connected with the moving cross beam plate, the submerged-arc welding unit is used for conducting filling welding on the backing welding portion of the rare earth steel structure, and the cleaning unit is used for cleaning the backing welding portion of the rare earth steel structure. The cleaning unit is used for cleaning weld zone base metal of the rare earth steel structure; the invention aims to solve the technical problem of how to carry out submerged-arc welding filling welding after gas shielded welding bottoming of rare earth steel.

The invention relates to the field of wind power tower tube welding, in particular to automatic welding equipment for wind power tower tube production and a control method.The automatic welding equipment comprises a seat rail, and a sliding table is arranged on the seat rail in a sliding fit mode; the limiting mechanism is used for carrying out clamping and heat insulation treatment on the tower drum, and the limiting mechanism is arranged on the sliding table; support rollers are arranged on the seat rails, each support roller is composed of a supporting seat and a rotating roller, the number of the support rollers is two, the support rollers are symmetrically arranged on the two sides of the lower portion of the tower drum and used for driving the tower drum to rotate, and the rotating rollers in the support rollers are connected with a motor through a coupler. According to the automatic welding equipment for wind power tower drum production and the control method, a device with a certain low temperature is placed at the welding position, so that the device is used for absorbing waste heat, the influence of high temperature on base metal near a welding seam is reduced, and the problems of coarse grains, hardness reduction and the like are avoided.

To obtain excellent welding quality by suppressing an increase in generation amount of spatters even when a short circuit occurs between a welding wire and a base material in consumable electrode pulse arc welding.SOLUTION: A feed speed Fw of a weld wire is set to a forward feed peak during a peak period from a time t2 to a time t3, and is set to a reverse feed peak during a base period from the time t4 to the time t52, and a start of the peak period at the time t41 is delayed until a short circuit between the weld wire and a base metal generated during the base period at the time t52 is released.SELECTED DRAWING: Figure 3

To provide a welded joint which has excellent low-temperature toughness, is suppressed in stress corrosion cracking caused by liquefied ammonia, and has 490 MPa or more of tensile strength, and a method for manufacturing the welded joint.SOLUTION: A welded joint has a base metal, a weld metal, and a welding heat affected zone. In the welded joint, each of the base metal and the weld metal has a chemical composition of a specific range, the area fraction of bainite structure from 1 / 4 thickness to 3 / 4 thickness in the sheet thickness direction from the surface of the base metal is 90% or more, Vickers hardness at the 1 mm position in the sheet thickness direction from the surface of the base metal is 210 or less, Vickers hardness in the welding heat affected zone is 210 or less, Vickers hardness in the weld metal is HVW or less (HVW=260-200×Ni), the tensile strength of the base metal and the welded joint is 490 MPa or more, and the absorption energy of the base metal and the weld metal in Charpy impact test is 47 J or more at -40°C.SELECTED DRAWING: None

The invention discloses a method for controlling the hardness of a CrMo steel welding heat affected zone, which belongs to the technical field of welded joint performance control, and comprises the following steps of: preheating a base metal before welding at the preheating temperature of not lower than 200 DEG C; sequentially welding a backing weld bead, a hot weld bead, a filling weld bead and a cosmetic weld bead on the base metal; the interlayer temperature does not exceed 300 DEG C; before the cosmetic weld bead is welded, the temperature of the base metal is not lower than 260 DEG C; the base metal is subjected to postweld heat treatment, the temperature is increased to 480 DEG C at the temperature increasing speed of 80-150 DEG C / h, and heat preservation is conducted for 1-3 h; raising the temperature to 650 DEG C at the temperature raising speed of 80-150 DEG C / h, and keeping the temperature for 7-9 hours; cooling to room temperature at a cooling speed of 80-150 DEG C / h; according to the method, the preheating temperature during preheating before welding, the interlayer temperature in the welding process, the lowest temperature of base metal during cosmetic weld bead welding and the heat preservation temperature and the temperature increasing and decreasing speed of all stages of postweld heat treatment are controlled respectively, the hardness upper limit value of the CrMo steel welding heat affected zone can be effectively controlled, and the safety and reliability of a welded joint are improved.

The invention provides a red copper connector and a diffusion welding method thereof, and relates to the technical field of metal welding, the diffusion welding method of the red copper connector comprises the following steps: taking a red copper base material, and performing nanocrystallization treatment on one side surface of the red copper base material through an ion impact method to form a welding surface; the annealed copper middle layer is placed between the two pieces of red copper base metal, the annealed copper middle layer makes contact with the welding face, and a connector to be welded is formed; and the connector to be welded is welded through a pulse current auxiliary diffusion welding method, the red copper connector is obtained, the welding temperature of the pulse current auxiliary diffusion welding method is 300 + / -5 DEG C, the pressure is 18-22 MPa, and the heat preservation time is 25-35 min. And low-temperature, rapid and small-deformation reliable connection of the red copper base metal is achieved.

The invention discloses a welding seam detection remanufacturing system and device for a hydraulic support, particularly relates to the technical field of mining equipment remanufacturing, and is used for solving the problems of secondary stress migration and base material cracking caused by local heat input during in-situ repair of a box type structural part. A data acquisition module is used for acquiring contour coordinates of a repair area and thickness distribution of base metal; the unit division module divides a stress buffer unit containing a heat input regulation and control subarea based on the thickness gradient and the rib plate layout; the boundary redivision module dynamically optimizes the subarea boundary through geomagnetic field gradient scanning; the heat shock control module executes layered repair welding and activates subarea heat input in sequence; the energy ratio monitoring module switches the activation sub-regions in real time according to the acoustic emission energy ratio to block microscopic plastic deformation; the stress processing module eliminates a migration stress peak value through external expansion area residual stress scanning and local thermal relaxation; the whole-process regulation and control of the stress evolution in the repairing process are realized, and the repairing safety and the service life of the box type structural member are guaranteed under the immovable working condition.

The invention provides a method for connecting a titanium-aluminum material and a nickel-based superalloy and a brazing filler metal composition, and relates to the technical field of material welding, and the brazing filler metal composition for connecting the titanium-aluminum material and the nickel-based superalloy comprises a high-entropy alloy middle layer and a Cu middle layer. The Cu intermediate layer is introduced between the high-entropy alloy intermediate layer and the base metal nickel-based superalloy, the low melting point of the Cu intermediate layer is utilized, the Cu intermediate layer is melted into a liquid phase in the welding process, a high-temperature liquid phase environment is formed, element diffusion of the high-entropy alloy intermediate layer and the nickel-based superalloy is facilitated, element exchange between the high-entropy alloy intermediate layer and the nickel-based superalloy is promoted, and the welding quality is improved. And the welding temperature is reduced by 30-100 DEG C, the welding temperature is reduced to 1100-1160 DEG C, the welding temperature is lower than the Ni-based high-temperature alloy solution treatment temperature, Ni-based high-temperature alloy grain growth is avoided, the high-temperature creep property of the Ni-based high-temperature alloy grain growth is kept, the joint structure is optimized, and the welding quality is improved.

The invention discloses AgCuNi multi-element brazing filler metal which is composed of, by mass, 5%-15% of Ni, 1%-5% of Sn, 1%-5% of Zn, 1%-5% of In, 0-1% of La, 0-1% of Bi and the balance Ag and Cu with the mass ratio being (68-76): (24-32), in addition, the invention further discloses a preparation method and a brazing process of the AgCuNi multi-element brazing filler metal, raw materials are smelted, rolled, annealed and thinned, and the AgCuNi multi-element brazing filler metal is obtained. And then the brazing filler metal, tantalum and Q345R steel are assembled into a to-be-brazed piece, and vacuum brazing is conducted on the to-be-brazed piece. The AgCuNi multi-element brazing filler metal is uniform in component, free of segregation and oxide inclusion and capable of being well combined with two kinds of base metal of tantalum and Q345R steel in the brazing process, a high-strength brazed joint is obtained, meanwhile, the brazing filler metal does not contain Ti, and the problem of weld brittleness caused by Ti is solved.

The invention relates to the technical field of machine manufacturing, and provides a stainless steel rocket storage tank barrel section forming method, device, equipment and medium, the method comprises the steps that an X-ray diffraction test is conducted on a sample, and the martensite volume fraction and dislocation density are obtained based on an obtained diffraction curve; constructing a first function based on the martensite volume fraction, the corresponding environmental parameters and the deformation amount of the deformed sample; obtaining yield strength according to the dislocation density, and constructing a quantitative model according to the yield strength and a first function; and actual operation parameters are obtained and input into the quantitative model, corresponding optimal operation parameters are obtained, and the rocket tank cylinder section is manufactured. According to the method, the base metal and the welding seam are deformed at the same time by adopting the obtained optimal operation parameters such as low-temperature parameters to conduct a low-temperature deformation method, so that the base metal and the welding seam are both subjected to deformation strengthening, the joint strength coefficient of the cylinder section welding seam is improved, the integrity and reliability of the component structure are improved, resource waste is reduced, and the production efficiency is remarkably improved; and the comprehensive performance of the rocket tank is improved.

The invention discloses copper-aluminum ingot containing barrel heating pipe forging equipment, and belongs to the field of copper-aluminum machining, the copper-aluminum ingot containing barrel heating pipe forging equipment comprises a base and a forging and pressing part, the base is connected with a synchronous translation assembly, the synchronous translation assembly is fixedly connected with a material turning driving part and a vibration matching assembly, and a rotating shaft of the material turning driving part is fixedly connected with a clamping fixing part; an insertion part is clamped and fixed at the clamping end of the clamping and fixing part; the movable column axially moves in the inserting rod in a reciprocating mode to generate vibration, the vibration is conducted to a heating pipe base body outside the inserting rod through the inserting rod, instantaneous impact force generated by the vibration can destroy a bonding interface between oxide skin and base body metal, adhesive force is reduced, micro cracks are generated on the bonding interface between the oxide skin and the base body, and the service life of the heating pipe is prolonged. After multiple times of overturning and oscillation, the cracks can expand and converge, so that the oxide skin is layered and peeled off, the loose oxide layer on the outer surface of the base body is peeled off, and the situation that the forging head and a workpiece are isolated by the oxide skin, and consequently the base body has defects is avoided.

The present invention belongs to the technical field of material heat treatment, and specifically relates to a method for avoiding post-weld reheat cracks in thick-walled precipitation-strengthened superalloys, including: the first step, after welding, heating from room temperature to 20°C below the isothermal transformation curve where γ' phase precipitates at a heating rate of ≤100°C / hour, and holding for 1 to 2 hours; the second step, then heating at a heating rate of 160 to 220°C / hour to 20 to 70°C above the recrystallization temperature of the base metal, and holding for 1.5 to 3 hours; finally, cooling in the furnace to 250°C and then taking out of the furnace and air-cooling to room temperature. Through the post-weld heat treatment method of the present invention, while avoiding strain-age cracks, it can completely eliminate welding residual stress and strengthen the welded heat-affected zone, thereby ensuring that the comprehensive performance of the welded joint reaches "equal matching" with the base metal.

The invention provides an electrode grid line and a preparation method thereof and conductive slurry, the electrode grid line comprises a seed layer and a base metal layer superposed on the upper layer of the seed layer, the base metal proportion in the conductive phase of the base metal layer is greater than 68%, the seed layer comprises a main grid and a seed layer fine grid, the base metal layer comprises base metal layer fine grids electrically connected with the seed layer fine grids in a one-to-one correspondence mode, at least one of the seed layer fine grids and the base metal layer fine grids is further provided with a plurality of contact pins, and the contact pins are distributed in the length direction of the corresponding fine grids at intervals. And the width of the contact pin in the line width direction of the fine grid is greater than the line width of the fine grid. The electrode grid line with the preset height is formed in a grid stacking mode, base metal is utilized by the base metal layer, the overall silver consumption amount of the electrode grid line is effectively reduced, the part, exceeding the width of the thin grid line where the contact pin is located, of the contact pin arranged on the thin grid line can be used for compensating printing precision deviation, the precision requirement for printing operation is reduced, and the contact performance is improved.

To provide a welded joint which has excellent low-temperature toughness and is suppressed in stress corrosion cracking caused by liquefied ammonia, and has 570 MPa or more of tensile strength, and a method for manufacturing the joint.SOLUTION: A welded joint is provided, having has a base metal, a weld metal, and a welding heat affected zone, each of the base metal and the weld metal has a chemical composition of a specific range, the area fraction of a bainite structure from 1 / 4 thickness to 3 / 4 thickness in the sheet thickness direction from the surface of the base metal is 90% or more, Vickers hardness at the 1 mm position in the sheet thickness direction from the surface of the base metal is 230 or less, Vickers hardness in the welding heat affected zone is 230 or less, Vickers hardness of the weld metal is HVW or less (HVW=260-100×Ni), the tensile strength of the base metal and the welded joint is 570 MPa or more, and the absorption energy of the base metal and the weld metal in Charpy impact test is 47 J or more at -40°C.SELECTED DRAWING: None

The invention belongs to the technical field of spiral welded pipe coping, and particularly discloses a coping device and method for spiral welded pipe machining, and the coping device comprises a rack, a pipe end clamping mechanism and a shape follow-up self-adaptive grinding unit. By means of the integrated self-adaptive adjusting mechanism and the multi-dimensional adjusting assembly, spiral welding pipes with different pipe diameters can be rapidly clamped, and the space postures of the grinding wheels can be accurately aligned; particularly, a flexible avoiding mechanism supported by a spring is utilized, so that the guide wheel and the grinding wheel synchronously float when encountering a high welding seam, the clamping stagnation damage of equipment and the bending of a grinding wheel shaft are effectively avoided, the heat influence caused by severe friction is obviously reduced, the metallographic structure change of the welding seam and base metal is prevented, the corrosion resistance of a welded pipe is guaranteed, and the service life of the welded pipe is prolonged. And in cooperation with automatic seam searching of the guide wheel, automatic and high-quality grinding of all welding seams is achieved.

The present disclosure relates to the use of carbonaceous matter and a reagent comprising a thiocarbonyl functional group, for example, in a method for extracting a base metal such as copper from a material comprising the base metal. Such methods can comprise contacting the material under acidic conditions with the carbonaceous matter and the reagent comprising the thiocarbonyl functional group; and optionally recovering the base metal.

The invention provides base metal main grid slurry, a preparation method thereof and a photovoltaic cell. The base metal main grid slurry comprises 3-8 parts by mass of nickel powder, and the surface of the nickel powder is coated with a modified component; 0.5-1 part by mass of first glass powder; 0.5 to 1.5 parts by mass of second glass powder; 13-16 parts by mass of an organic phase; 0.2 to 0.5 part by mass of an organic auxiliary agent; 15-25 parts by mass of a first silver powder; and 45-60 parts by mass of a second silver powder. The base metal nickel is used for replacing part of silver powder, the wettability is improved through surface coating, meanwhile, glass elements are optimized, the glass softening point is reduced, the paste can be sintered at the low temperature, close combination of silver particles is facilitated, and the density and conductivity of a conducting layer are improved. According to the technical scheme, the sintering is compact, the conductivity is slightly higher than that of pure silver paste, and the effects that the efficiency is equal to that of the silver paste and the tension is slightly lower than that of the pure silver paste are achieved.

The utility model discloses an auxiliary tool for grinding the excess weld metal of a welding seam, which is used for assisting a grinding machine in grinding the welding seam of a welding base material. Comprising a movable adjusting platform and a stabilizing mechanism; the grinding machine is mounted on the movable adjusting platform; the movable adjusting platform is used for moving and adjusting the grinding machine, so that the bottom of a grinding piece of the grinding machine is parallel to the outer tangent line of the weld joint. The stabilizing mechanism is connected with the movable adjusting platform and the welding base metal, and the movable adjusting platform is kept on the surface of the welding base metal through the stabilizing mechanism so that the movable adjusting platform can move along the surface of the welding base metal. The angle of the grinding piece of the grinding machine is adjusted through the movable adjusting platform, movable grinding is achieved, the grinding machine is kept stable through the stabilizing mechanism, and therefore the grinding precision and the flat and smooth effect of the grinding face are guaranteed, welding base metal is not prone to being damaged, and follow-up nondestructive testing and anti-corrosion work of welding seams are facilitated; and operation is easy, time and labor are saved, the requirement for operating skills of operators is lowered, and the grinding efficiency is improved.

The invention relates to a novel high-manganese austenitic steel manual arc welding rod for frog repair. The welding rod comprises 70-80 wt% of a welding rod core and 20-30 wt% of a coating, wherein the outer surface of the welding rod core is coated with the coating. The welding rod core comprises the following chemical components in percentage by weight: 0.95 to 1.2 weight percent of C, 36 to 46 weight percent of Mn, 2.0 to 4.0 weight percent of Mo, 1.0 to 5.0 weight percent of Cr, 0.5 to 6.0 weight percent of Al, 0.5 to 6.0 weight percent of V, 0.5 to 4 weight percent of Cu, 0.1 to 1.0 weight percent of Si, less than or equal to 0.002 weight percent of P, less than or equal to 0.002 weight percent of S and the balance of Fe and inevitable impurities; the coating comprises the following chemical components in percentage by weight: 20 to 30 percent of marble, 10 to 20 percent of fluorite, 10 to 20 percent of rutile, 4 to 6 percent of 45 ferrosilicon, 5 to 8 percent of low-carbon ferromanganese, 5 to 8 percent of sodium carbonate and the balance of iron powder. The welding rod is matched with frog base metal, good metallurgical bonding is generated, and the welding rod has the advantages of being low in hot crack sensitivity, excellent in impact wear resistance, high in strength, hardness and toughness, low in cost, simple in component system, excellent in operation manufacturability and the like.

The invention provides a low-temperature impact energy stabilization process for a cylindrical forge piece, which enables the low-temperature impact energy of the manufactured cylindrical forge piece to be stable, enables the low-temperature impact value of the cylindrical forge piece to have a higher percent of pass, and ensures the quality of a pressure vessel. The method comprises the following steps that S1, element matching is conducted on a 20MnNiMo base metal raw material, and then smelting is conducted to obtain a steel ingot; s2, the steel ingot is forged, and a blank cylinder piece in a set shape is obtained through combination of a two-way forging method and a reversing forging method; and S3, performing post-forging heat treatment, rough turning exposure, UT flaw detection and cold saw cutting according to the length of the forge piece on the blank cylinder piece to obtain the cylinder forge piece.